A suicide car bomb exploded outside a popular hotel in Somalia’s capital on Saturday, killing at least 13 people and wounding more than 16, and gunfire continued inside as security forces pursued the attackers, police said. Two more blasts were heard in the area, one when an attacker detonated a suicide vest.

Speaking to the Associated Press by telephone from the scene, Capt. Mohamed Hussein said security forces were battling extremists who were holed up on the top floor of the Nasa-Hablod hotel, which is close to the presidential palace and is frequented by politicians and other members of Mogadishu’s elite. The attackers hurled grenades and cut off the building’s electricity as night fell.

Saturday’s blasts came two weeks after more than 350 people were killed in a massive truck bombing on a busy Mogadishu street in the country’s worst attack ever.

Shabab, Africa’s deadliest Islamic extremist group, quickly claimed responsibility for Saturday’s attack and said its fighters were inside the hotel. As night fell, sporadic gunfire could be heard as soldiers responded.

A Somali police colonel and a former lawmaker were among the dead, Hussein said.

Mohamed Dek Haji was injured as he was walking near the hotel when the attack began. He said he saw at least three armed men in military uniforms running toward the hotel after the suicide bombing at its gate.

“I think they were Shabab fighters who were trying to storm the hotel,” he said, lying in a hospital bed. He suffered small injuries on his shoulder and skull from flying glass.

Witnesses in some previous attacks have said Shabab fighters disguised themselves by wearing military uniforms.

Shabab often targets high-profile areas of Mogadishu. It has not commented on the massive attack two weeks ago; experts have said the death toll was so high that the group hesitated to further anger Somali citizens as its pursues its insurgency.

Since the blast two weeks ago, President Mohamed Abdullahi Mohamed has visited regional countries to seek more support for the fight against the extremist group, vowing a “state of war.” He also faces the challenge of pulling together regional powers inside his own long-fractured country, where the federal government is only now trying to assert itself beyond Mogadishu and other major cities.

A 22,000-strong multinational African Union force in Somalia is expected to withdraw its soldiers and hand over the country’s security to the Somali military by the end of 2020. U.S. military officials and others in recent months have expressed concern that Somali forces are not yet ready.

The U.S. military also has stepped up military efforts against Shabab this year in Somalia, carrying out nearly 20 drone strikes, as the global war on extremism moves deeper into the African continent.